Index of Publicty Available Database Software

The software systems and tools listed below were announced to be available free of charge
- at least as beta releases and at least for academic and/or personal use.
See instructions at the end of the page on how to submit new
entries to the list or to correct existing entries. Also report when a package is
no longer available free of charge.

Mckoi SQL Database is a complete SQL management system
written entirely in Java. It can operate as a multi-threaded multi-user
database server or embedded in a Java application. Released under the
GPL open source license.

A
system from the University of Arizona that supports the management of
multiple calendars, through temporal extensions to SQL. A main-memory
DBMS is also available that can be used as a substrate for the calendar
system.

PREDATOR is an object-relational database system developed at Cornell
University and now maintained at University of Copenhagen.
PREDATOR is supported as a research and educational tool.
Source code is available.